95125-87-4

Upstream product

• 60788-62-7 2,4-dibromo-3-hydroxy-13β-estra-1,3,5(10)-trien-17-one 
• 53-16-7 Estrone 

Downstream Products

• 1266679-87-1 2-phenyl-3-hydroxyestra-1,3,5⁽¹⁰⁾-trien-17-one 
• 959393-66-9 C₂₅H₂₇BrO₂ 

Relevant academic research and scientific papers

Coumarins by Direct Annulation: β-Borylacrylates as Ambiphilic C3-Synthons

Modular β-borylacrylates have been validated as programmable, ambiphilic C3-synthons in the cascade annulation of 2-halo-phenol derivatives to generate structurally and electronically diverse coumarins. Key to this [3+3] disconnection is the BPin unit which serves a dual purpose as both a traceless linker for C(sp2)–C(sp2) coupling, and as a chromophore extension to enable inversion of the alkene geometry via selective energy transfer catalysis. Mild isomerisation is a pre-condition to access 3-substituted coumarins and provides a handle for divergence. The method is showcased in the synthesis of representative natural products that contain this venerable chemotype. Facile entry into π-expanded estrone derivatives modified at the A-ring is disclosed to demonstrate the potential of the method in bioassay development or in drug repurposing.

Synthesis and structure–activity relationships of 2- and/or 4-halogenated 13β- and 13α-estrone derivatives as enzyme inhibitors of estrogen biosynthesis

Ring A halogenated 13α-, 13β-, and 17-deoxy-13α-estrone derivatives were synthesised with N-halosuccinimides as electrophile triggers. Substitutions occurred at positions C-2 and/or C-4. The potential inhibitory action of the halogenated estrones on human aromatase, steroid sulfatase, or 17β-hydroxysteroid dehydrogenase 1 activity was investigated via in vitro radiosubstrate incubation. Potent submicromolar or low micromolar inhibitors were identified with occasional dual or multiple inhibitory properties. Valuable structure–activity relationships were established from the comparison of the inhibitory data obtained. Kinetic experiments performed with selected compounds revealed competitive reversible inhibition mechanisms against 17β-hydroxysteroid dehydrogenase 1 and competitive irreversible manner in the inhibition of the steroid sulfatase enzyme.

Electrochemical A-ring bromination of estrogens

A-ring bromination of estrogens has been achieved by constant current electrolysis of the solutions of these substrates and Et4NBr in appropriate solvents. Thus, electrolysis consuming 2 F mol-1 charge gave mixtures of 2- and 4-estrogens (1:1.1-2.5; up to 97%), whereas 4 F mol -1 charge experiments yielded 2,4-dibromoestrogens as the sole products.

Chemical synthesis of six novel 17β-estradiol and estrone dimers and study of their formation catalyzed by human cytochrome P450 isoforms

Our earlier studies have shown that over 20 nonpolar 17β-estradiol metabolite peaks were detected following incubations of radioactive 17β-estradiol with human liver microsomes or recombinant human cytochrome P450 isoforms in the presence of NADPH as a co

Synthesis of 2-Methoxy- and 4-Methoxy-Estrogens with Halogen-Methoxy Exchange Reaction

Synthesis of 2-methoxy- and 4-methoxy-estrone (6) and (9), 2-methoxy- and 4-methoxy-estradiol (15) and (18), and 2-methoxy- and 4-methoxy-estratriol (24) and (27) are described.Catalytic hydrogenation over Pd/C of 2,4-dibromo or 2,4-diiodo estrogens gave regioselectively the corresponding 4-halogeno derivatives in excellent yields.Reaction of 2-iodo or 4-iodo estradiol and 2-iodo or 4-iodo estriol with NaOCH3 in MeOH and dimethylformamide (DMF) in the presence of CuCl2 gave in an excellent yield and in a good yield, while (6) and (9) were also similarly obtained by the reaction with pyridine instead of DMF.

INFLUENCE OF A SUBSTITUENT AT C3 ON THE DIRECTION OF BROMINATION OF ESTRA-1,3,5(10)TRIEN-17-ONES

The influence of a C3 substituent on the direction of bromination of estra-1,3,5(10)-trien-17-one is discussed: Estrone and its methyl ether give mainly derivatives bromine-substituted in ring A, while the bromination of estrone acetate leads to the production of 16-mono-and 16,16,dibromo-substituted estrones.